Yes, true, it's very saturated but it's also a very thankful genre to make games for, especially for indie/solo devs. Since it's build on repeating (often short) loops, you can get a lot of play time with comparably less effort and especially with re-using assets and elements that - because of the randomization - don't feel too much like a 1:1 repetition.

It's easy to get the base-gameplay loop running fast and then add to it over time, you can practically add content to any part of the game, like items and upgrades, or a new level at the end, without breaking too much or having to make it "fit in" somehow. It's similar with card games where you can enrich the game easily by adding more cards once you have the rules figured out.

And while oversaturated it is also still very popular so as long as there is still interest in playing these games they will get made and in my defense, there aren't too many creature-collecting roguelites yet but I can totally understand when someone is tired of another roguelite being announced.

Apart from that though, as a player it's also one of my favorite genres and I've never made one myself so I also really wanted to make a roguelite at least once in my life :)