Hi, Thank you for playing our game, hope you liked it!
The game has quite a few bugs that we should have fixed, but unfortunately we ran out of time. This game was made for a jam in 48h which is the reason for all the issues. If we could have even a few more days, I am sure none of these bugs would be present.
The shop got greyed out because you maxed out the upgrade. Due to running out of time I forgot to change the text to say maxed out.
Thank you again for making the video and giving us feedback about our game, it helps a lot. Hopefully next games will come out more polished and with fewer bugs :)