Graphic assets reminds me Baba is You, I liked that style! Troops' movements feel so fluent, I really liked it. Movement is just not basic grid movement. Well done, it gives life to this game. Also when you spawn troops, their offset is little bit off, not like chess pieces. And I really liked this too because it looks like they are real troops.
Like others said, this game needs balancing. But I managed to pass 2nd and 3rd levels. I just couldn't pass 1st level when fire pit came and started giving AoE damage and killing them all at the same time. I think your game always have 2 or 3 paths for troops like later levels in game. It adds some much depth and strategy into the game. 3rd level was my favorite! If you are going to make after-jam version (and I think you will because you wrote that at the end of the game), firstly start increasing health of snake unit. Because they just take one or two projectiles and they're gone. Because of that I rarely used snakes.
Overall, you nailed it, really good gameplay! Just needs some polishing meta-wise. Graphics, gameplay and sounds is already good enough for my taste. I'm looking forward to after-jam version!