So I'll start by saying I think the art and music in this are really good, I think the sprite art and color pallet are both nice. And I think the idea is very fun as well. But there are a few things that kept me from really enjoying it.
From reading the comments I guess I more or less finished it, since I explored every area. I'm not sure what happened but the workout mechanic seemed to be really bugged for me. After exercising my arms to level 1 , I went back with more protein powder and wanted to work out arms again. However when I did it, it switched from saying "next level 2" to "next level 1" and my level never increased past 1. This ended up happening to all 3 stats. Then after going all the way to the right I jumped down to where the last gym was and since I couldn't level up my legs past 1, I couldn't jump out again and was trapped so that's where my playthrough ended.
Either way, some bugs aside, I think the style and attitude of this game is fun, and I think with some polishing it could definitely be turned into a great game.