I appreciate you playing and rating my game! I definitely agree it feels a little too fast to level up early in the game. That particular part of the game ties into the overall balancing, which admittedly was the hardest part of the game. It was a constant push and pull, if the player levels up slower, the upgrades needed to be stronger to keep up with the enemies. Then the multiplicative nature of the upgrades snowballed higher with higher values and made the game too easy...etc
I'm getting PTSD just thinking about all the time i spent trying to balance the game haha
Again thank you for playing and the feedback!