Hey there! LOVED the vibe of the game, with its artstyle, graphics and music! It really is pretty nostalgic :)
I think It could be nice to have a small QoL change to the upgrade screen, foi it to be possible to exit with the "esc" key, since we'll be constantly popping in and out of it in between levels.
Also, is the "+10% per second" we see after a node levels up just 10% more credits? Or Exp?
I don't know if it was intended, but it seems like farming the first node/level is the best way to get credits and golden tickets quickly, especially with the "cells" upgrade, since you quickly get 4 ISs and the combo goes through the roof. It seems a bit redundant to play the more difficult levels for other reason than unlocking the IDs, since they're in random positions, the credit payoff is the same and you're less likely to get combos.
That being said, I'm really looking forward to see how the game expands and to meet more of the few characters we've seen in the demo! Already wishlisted it on Steam :)