Cute game!
I like the addition of "autobattler" mechanics like combining towers and moving units.
I do feel like the "grab" point on the units could be a little more generous, and maybe a tooltip or something explaining what each unit does before you buy them would be good.
I think your sound effects might be a little loud compared to your music. (The jam submission time was extended until tonight if you want to do a quick remaster.)
Overall though, a really solid game!