I had a lot of fun playing this! Bravo!
I only see your name as a Dev, if there was anyone else, good job to you too.
I really like the swap place mechanic. it made it a lot of fun to play. Especially with limited ammo I found myself using that mechanic as much as possible to save ammo.
The design reminds me a lot of N64 007 golden eye. It looks like the library level and actually had me clicking walls to see if I could open a secret lol. I didn't find one :(
The enemy health is so large and takes so many shots to kill, I wondered if it was glitching and he just wasn't going to die! Now that I've played the game, the health amount seems ok but a health bar for the enemies may have helped me confirm that shots are landing and doing something.
speaking of health bars. This game with the slow moving bullets and this swap ability. I think I would have had even more fun than I did if there were more enemies and less enemy health. lots of chaos and bullets spraying everywhere! more like a 3d bullet hell.
I found the enemies could push me into walls and I would get stuck. There may be other scenarios where this could happen but that is the only thing I found that could get me stuck in the walls. unfortunately the only way I found out was to reset.
I only got to use 1 upgrade :( I got one on the first death. Every other time I did not get enough kills to earn a new upgrade and then I won the game before dying again lol I'm not sure of a good solution to that. If you wanted people to be able to try more, maybe the exit at the end could just send you back to the angels and restart the level.
I would also add a web version if you can. Much easier for people to try if they don't have to download first.
overall, tons of fun! I would have kept playing for sure if I hadn't run out of game haha