Neat little game. I think it's a strong foundation, and there's a bunch of different directions you could take it. For example, it could be interesting if the blade spinning affects the player's fall speed or acts as a double jump, since it already kinda looks like a helicopter.
I have to agree with IcyZ1ne about removing the timer; it's not really necessary but maybe you could replace it with a stopwatch and leaderboard to encourage speedrunning.
Good job on completing your first game jam!