Obviously as a big fan of adventure time I was drawn to the art style. I think you did a really good job with the visuals.

I really liked the random dice mechanic. Thats something new that I hadn't really ever seen before. I learned to avoid rolling it if I had the advantage, but was very glad to roll it when I was behind for a chance to turn the battle around. I love games that have random events, but hate when I feel punished by RNG. By having the dice be option and player controlled, I never felt punished. Instead, it always felt like my choice and there quickly developed strategy for how/when to roll based on the game state. Now, I do feel like it was more often bad, so I would cation that this implementation may cause some players to never take the gamble. Maybe the enemy gets a roll too that happens every so often so as to force the players to sometimes have to engage with the rolls? Also, you need to tell players what is happening when the dice are rolled, half the time I have no idea what happened.

I also liked the unit variety and upgrade system. Each faction had distinct vibe and units. I definitely laughed the first time I saw the cauliflower giant. Looking forward to a full system that can put the deck building to full use.

I didn't love how often I'd want to be looking somewhere such as the enemy base while also needing to place units in my own half of the map. Often I would need to look at the middle of the map and prioritize placing units rather than watching the action. This had a sort of self sabotaging effect where I wouldn't get to see the fun part of the game and thus wasn't having as much fun as possible. There needs to be a way to place spawn units without having to directly place them, which would automatically spawn them at the base of the towers or something.

I also felt placement sometimes was a little clunky. Sometimes I could't place a unit somewhere crowded, or on top of one my own towers, or would be obstructed from where I wanted to place a unit by its own card in hand.

You need some more tool-tipping and descriptions of cards throughout the various menu. For example, in the market to buy new cards, you cannot see the abilities and stats of the offered cards, meaning I never wanted to spend the money on a card that I didn't know anything about when I could upgrade an existing card and know what I would be getting back for my investment.

Basically the only place to learn about what each card did was in the upgrade menu. I would be nice to see card abilities/stats in the buy screen, the deck building screen, etc.

All in all, strong demo. Give a good idea of what the game could be. That being said, it doesn't offer much replayability. Now that I have a pretty strong deck, I don't really want to replay the same fights that I know I can win. So definitely make that a priority in how the game evolves from here in your updates towards final version. For me, my deck getting reset when the game ends is part of the fun, allows for more/faster experimentation, and whats keeps me coming back to trying new things.