I genuinely like this.
The jumping is floatly and wonky as heck, so if you further work on this, the physics clearly need a vamp up : D
What I really find amazing though is the idea of using "saved time" as a currency to buy new upgrades. That's really cool, and me being a person that likes speedrunning games, this is an absolutely solid idea.
If you have a lot more levels, more precise controls this is absolutely fantastic.
One thing that also needs more work is making clear how "gaining" said time currency works. It seemed rather sporadic how much time to buy things I would get, because it did not seem to be the seconds I had left when finishing a level?
Also you need to clearly nerf the numbers, because I couldn't buy a single upgrade throughout a normal playthrough : p