Wait what? This is soo polished, i really liked it! Probably the most polished game I played in this jam, the art and gameplay were really good, also the sound effects, presentation and use of the limitation, add some music, more variety of enemies (2 cells into golems and archers only seemed a little op) and this may become quite a good roguelike mobile game.
If you intend having this on pc aswell - consider letting the player choose the unit with the numbers on the keyboard - would have made spawning different minions less clunky