I love the aesthetic of the 2D raygun and phone in the 3D world, it works really well. Similarly, I love the music: was it written by one of the team? There were a lot of places where it felt like sounds were missing, and getting coverage for more events and interactions in sound would be a worthwhile bit of polish. Also, on dying against the boss, I very abruptly accidentally progressed straight back to the start, and did not feel like redoing the whole game from that point up to the boss battle. It would be nice to implement a kind of checkpoint system.
Thanks for sharing the game, I love the aesthetic :)