Your correct! There shouldn't be multiple of the same upgrades at one time. Don't tell anyone what all the upgrades have the same chance of appearing ;)
I like the concept a lot and I can tell the art had a lot of effort put into it. The cover image is very nice and is a great representation of the game
The game itself doesn't run very well on my laptop and lags when new enemies spawned in.
The best part about this game is the polish and all of the effects. It looks super cool overall and it's very juicy. I like the upgrade system a lot and it adds some nice replay ability.
I did however experience the bug where the enemies spawn outside (I was full screened) and got soft locked a few times.
Overall the game loop is very fun and it really carries the other aspects.
I overall like the theme and the darkness effects really flow with the theme,
The limitation implementation is a little basic but I see what you were going for,
There are a few bugs with the camera snapping, laser disappearing, and oxygen levels not resetting upon completing the day. But overall not bad at all for a prototype!
I fully completed the demo and am looking forward so see how it progresses!
I just wanted to note that the goal of this project was just to complete the project to the end, and not fall victim to scope creep by adding too much complexity
