Really enjoyed this entry!! The art is gorgeous (this includes the itch io page), and the gameplay has pretty good feedback (the abrasive scratching sound sounds so heavy i love it).
It might help to indicate how one unit differs from another. From what I could tell it essentially boiled down to HP and speed ?
Also, the drawing mechanic is very cool. I like gesture controls in general, on mobile games for example, on UX/UI elements (like on some mobile phone with screen turned off), but they tend to work best when unconstrained from a grid system. In this case, the gestures couldn't be performed quickly because of how precisely I had to align with the grid. (Admittedly for a 48h game jam it would have been horrendous to do differently!)
I had really good fun playing this game, well done to the team!