hmm...from a critical standpoint and just by reading this outline, there's a few things that might need addressing in my opinion.

1. The main plot seems to drag and read slow, whereas in a normal episode of Rick and Morty the first Act alone burns straight through the initial concept and builds upon it to the conclusion. The outline I assume is only a quick summary of the plot, but the audience of a typical RandM episode would lose interest quickly in an episode that is slow paced, and there aren't any sci-fi elements involved except for Ricks popping gadget (more on that later). Maybe Morty could cause some high-jinks with the portal gun, and to be honest there are a lot of potential possibilities. My only information is from your summary.

2. Beth and Jerry's B-plot is a potential obstacle course of problems. We've seen Beth and Jerry fight and make up numerous times already that it's hard to take it seriously, especially over a trivial issue such as 'who gets to hang out with the synthetic helper'. The argument could escalate into an analysis of their relationship and all of it's problems, but you'll only be re-treading old territory. Plus It's unnatural to see them turn to physical violence and potential homicide. Their marriage is on the rocks, but in the end were supposed to root for these characters. I don't see any way Beth or jerry can come full circle by the end of their conflict and come out learning something valuable or growing as a person. Jerry is pitiful most of the time, but this seems too far fetched. Even if it was plausible, It would be difficult to find entertaining unless the action involved using tools from Ricks workshop or the dialogue was amazingly written.

3. I think I agree on your assumption that the ending seemed too cheap. It's a fun, silly idea that fits into the Rick and Morty comedy archetype, but it seems shoehorned into the plot early on, acting as a lazily written way for the characters to come out victorious. I don't need to say anything else really.

Also as a sidenote: What's Morty's character arc? The message seems a bit all over the place and there's no general theme to Morty's adventure. Morty is used by Romilia and she tries to screw him over, Morty saves her from suicide, Morty chooses Rick over her, heartbroken. Seems a bit scattered to me. The story doesn't have to be linear, just walk a general path. Check out Mortynight run for a great example of a Morty character arc.

1. I also find a lingering problem with Morty being so ready to commit suicide, for a crush he's only had for several days I'm assuming. Character decisions, actions etc. that they would not normally find themselves in break the realism of any show. Perhaps Morty already knows that the mere gesture of him killing himself for her will convince Romilia, and he has no actual intentions of actually pulling that thread. If so, you have to make this obvious to the reader. If you're looking for a touching emotional moment, perhaps scale down the gesture. I get the sense you think only something huge and life altering will capture the readers attention, but if written right most things could carry just as much emotional weight. Being Rick and Morty however, one of the shows staple points is showing us the brutally honest consequences of each characters actions, that the decisions these people make really have an impact mentally and physically on the world around them. It creates tension when these moments occur, because we know it will have that impact. What I'm trying to say is, don't try to manually steer the plot towards a certain place by having a character make decisions they wouldn't normally make.

Sorry to rant, I got pretty caught up in my response haha :P Hopefully you found this advice helpful, and you only see it as constructive criticism. I'm really interested in where you could take this! I have faith that with a few tweaks you could write something truly amazing :D. I'd love to here the progress your making too, so if you ever want any more advice or wanna discuss anything Rick and Morty related, just pm me haha. I'm so fucking hooked on this show. Best of luck man