I liked the game a lot! The concept is amazing, i always liked to spin chair like that so thats like THE PERFECT SIMULATOR. I DIDNT KNOW I NEEDED IT BUT THANKS FOR MAKING IT. And i looking foward to the updates.
Now regarding the gameplay itself i liked the gameplay loop a lot more than i thought i would, you were able to make a pretty engaging and addictive game! I could play it for hours (or until my hand fucking dies). So i think you are in a pretty good direction in general.
Some minnor things i didnt like was only that the way the game works isnt intuitive sometimes (like the fact that the rocks makes you faster, how the boost in the beggining works, how the money works and what triggers the chair to go up). But these are minnor things that the player can figure out in some time so i is not that big of a deal.
I guess the major problem with the gameplay is the balancing of upgrades that makes the game feel a little grind after some time, but i think you already knew that so, the others aspects are great so far.
Another major thing that i didnt like was the flying chair section, i think that trying to catch the rocks is a little too dificult, and relies much more on luck than ability since the controls at that part are too clumsy and the rocks are too fast... That makes that part very frustranting to me after some time (but take this with a grain of salt, my reflexes arent the greatests so maybe i just suck at that section hahaha)