This game is definitely harmed by the low resolution restriction- it feels like you're squinting at a tiny part of a GBA screen... I tapped shift which apparently skipped a ton of battles, so I only REALLY experienced the last one, when I finally took my hands off the dang keyboard and let the entry animations all play...
The gameplay is solid! Although I'm not sure how much strategy is truly involved, since the units aren't very differentiated in terms of strengths and weaknesses, seeming more like there are simply "strong" units and "weak" units. (As in, I didn't really have to hide certain units behind others to keep them away from their weaknesses while allowing them to strike their strengths. Just kinda drove over the advancing human wall)
I saw some subpixels in there!! The healthbars seem misaligned with the pixel grid behind them, and the animation between levels definitely doesn't follow a 64x64 restriction. By the minuscule 3x3 font, though, I can tell there were efforts and sacrifices made to stick to the resolution restriction.