Hi ExplosiveJam!
Wow! What an excellent little tower defense experience! I love the idea of building your own battlefield, it reminds me of Sanctum, one of my all time favorite games.
One way to improve this is to have a tooltip telling the player what each of the slimes do, so the player can strategize with complete information. Also it would be cool if there were a way to pause while you set up your defense and call the wave at your leisure!
With my cheesiest strategy I only got to level 6, but boy did it feel like an accomplishment after failing quite frequently. Thanks for sharing this game is sweet! Good luck!
Best,
Brandon from TheIndieDream