I didn't even play for a minute and I'm done playing. What is this? The first upgrade is infinitely better because it's price never goes up. 25,000 sweat = 1000 sps if you buy nothing but hearts but, if you buy the most expensive upgrade, it only equals 600 sps? I'm sorry, but this doesn't make sense. Either items need to increase in price or the sps needs to change because, as is, you just buy one item.
Then there's the gameplay over all. No music, no sounds. Items you buy don't appear either. It feels as if you're getting anywhere or doing anything. Literally, nothing changes.
Lastly, where are some upgrades? Buying items, without having some upgrades, makes it seem like there's even less progress. This, combined with the lack of price growth, make it so you can't really progress even slightly, especially so with the fact all you need to do is buy the heart and nothing else.
The games has a good concept and a good idea behind it but it needs a lot of work, and a lot more features, and some kind of show of progression. Really, even your character getting buffer, getting better workout gear, or even having friends tag along(either as upgrades or purchased to increase spc/sps) would make it ten times more compelling. That's really all I have to say. I hope this helps you improve your game, or make a new one that has more to it than this one. Good luck!