This was really cool. The shrink effect felt great and was super thematic. I especially liked the cinematic letterbox bars and the sound effects that came with it. It made the whole thing feel way more dramatic.
The slow-mo aspect of it was also done really well. It had a nice bullet-time feel to it and reminded me a lot of Max Payne back in the day. Really added weight to the action.
Nice work, especially for your first published game. The shrink mechanic had a strong presence and felt like a real part of the game instead of something just added for the theme.