A submission that satisfies the core criteria for what a platformer is, mechanically the game works, with an interesting punishment system. A lack of lives but the need to complete the level within a time frame punishes late-game mistakes, naturally increasing the skill requirement.
Gameplay and visual wise, this was fairly basic and I think could have been better with the given timeframe. Outside of the timelimit being constant, even if the character dies, there isn't anything terribly unique. Some of the platforms clashed with the background which made some of them hard to see. Jumping was a bit too fast and high, making it feel awkward to use at times. Some interesting level design would have mitigated this issue, but to be honest only a few values would have needed to be tweaked. Finally, you can infinitely jump and fly off-screen, bypassing the whole level which doesn't make for engaging gameplay. Most of these issues are indicative of a lack of playtesting, which is a crucial aspect of game development.
Overall, an attempt has been made to create a platformer, and for some of you this is your first experience working with others making a game. Use what you have learnt during this process to improve yourselves going forward.