Your pixel art is really next level beautiful. Fantastic work.
The game mechanics were interesting, but I felt the enemies had too much health early on so it was difficult to get to enjoy the later parts of the game. Deploying spirits as turrets also seemed to be less powerful than I would’ve hoped as the died pretty easily so I was mainly fighting with my water spray, kiting the slimes behind me/around corners so they would run into my spray.
I was able to get to the horned monster guy, but ran out of water gun because I had spent it all on the upgrade previously. Not sure what I was supposed to do to kill him after I ran out of ammo so I ended up dying :(
Overall, I think the game has a very fun premise, especially with the idea of capturing spirits to redeploy as turrets that help, but also make it higher difficulty due to more bullets to dodge. Maybe some slight tweaks to health/damage, and maybe making your water gun not consume your currency would make a more gentle start to the game so players can progress further/upgrade more later.