I like short and simple games but I think your game is a little too simple. I like the idea you chose, choosing doors in an endless scroller is fun and engaging but I believe you could do more than this.
This game is about two things: running to the right and sometimes jumping. It's too plain. There are some buffs like invincibility and moving faster but they are generic and there could be none and nothing would change. But if you add a little twist to every pick up and/or just a small score boost they will instantly become more important and more engaging to collect.
The main gameplay loop needs some improvements too. After dashing through five or six doors player knows about everything and playing becomes quickly repetitive and boring. I suggest adding more obstacles, maybe platform which don't insta-kill the player or biome specific modifiers to make the loop better and interesting.
I would also think about changing running to more stationary and each skill or just dashing will change player position. There could be also twist with the door where better door and thus with more dangerous biomes behind them could be time-locked and proper use of dashing and collecting pick ups is necessary to reach them. Platforms would be useful too to get to them and to avoid obstacles. In my opinion I would remove the double jump ability and instead I would add this as a power up. This small change would make this ability feel stronger and will perfectly fit with yours and my idea of the game loop.
I enjoyed the game but it became quickly boring. There's still room for improvements and some suggestion I have written show that. But good job on making a team and finishing before the deadline!