Very fun game!
The puzzles were engaging and the mechanics were really well implemented. Even the main menu was creative and fun to use. I really enjoy the overall visuals despite their simplicity, the lighting and colors really help sell it and I think it was done well.
As for criticisms I definitely think there should be more of a visual indicator of if a target has been hit already or not, I found myself stuck in the last room for quite a while until I realized that I had missed the far back target after thinking I had hit it. I also feel that there could be a bit more clarity in the opening segment as there's no real guidance telling you what is what and what does what. Some dialogue at the beginning to explain the basic mechanics to the player will really help to avoid any confusion and still leave room for them to solve the puzzles themselves afterwards.
The minigame is fun but could use some tweaking, enemy spawns don't really seem to change and the first time I played it despite never missing a single enemy I still ran out of ammo because none of them dropped any. Upon my second playthrough I got better drops but still only managed about 25 points before running out of ammo.
Despite my many critiques I still had a ton of fun with this one and liked it a lot. This game was super well polished though and has room to become something much greater if you continue development. Great work all around!