I had lots of fun with this even though I think the game tuning is way too harsh. I played it several times, farthest I got was the clone after the lightsaber cat. I like how in encounters with multiple enemies the RPS concept gets deeper because the enemies can essentially stack options on one tick. I feel like the player's options are too undertuned or equal to the enemies' options though.
Like the cabomination is basically a do you have multiple defense mitigating options or a good destabilizer build, which is hard to build sometimes. Like I don't feel blue defensive options are very common, yet in that encounter you have to eat 30-ish damage per turn until the timer hits zero. I had a defensive corrosive build and I still barely survived that. Like, even the elites in StS2 usually have cooldown turns, y'know? And then afterwards the clone has a corrosive build, so you basically need to have steal soul for your corrosive build to gain an advantage. And they do a hefty amount of damage too. The upgrades feel kind of useless, because having more options is simply better. Like having 3 more block isn't gonna matter for the cabomination fight. Corrosion+ is also kind of useless in boss fights because the timer ticks down the same (and the clones apply unstable too), and it's not hard to apply it multiple times in the first place.
I think it's impossible to have an offensive build in this game, because your DPS is simply worse than the opponents'. The best red skills are the utility ones imo.
Having a limited amount of slots for skills feels rough given that each boss fight is basically a build check so you just kind of just eat crud sometimes since your build isn't good against that fight. This could potentially be remedied with giving the player more or stronger options or simply adjusting enemy patterns to be less harsh or at least cycle through different patterns.
On my first playthrough I encountered a bug where the UI disappeared after I tried to replace an option. It reappeared after I ended my turn, although it didn't feel great eating that damage.
Great game, great concept, could use better tuning. I think you have something good cooking. Visuals kind of reminded me of Earthbound.