Thank you for trying it out!
Honestly, I was debating with myself whether to keep the blind falling enemies and hidden spikes as the game only had a few levels so I had to make it harder than intended for the last level. And it was supposed to be for a 1920x1080 resolution but I encountered issues when uploading it here so I had to downscale it to 800x600, resulting in making it harder than it already is due to the smaller area of vision. I'll check on how I can widen the screen view and update it when I can.
As for the jumps, I encountered it too but I thought it was just my keyboard. Didn't really find a way to fix it but I noticed that it almost always happened to me when trying to jump near an edge. It is one of the reasons why I added the "known bugs" in the game description.
Still, thank you again for trying it out! :D We really appreciate it!~