Nice entry !
A bit rought on the edges but the main gameplay is there and it works fine :)
Some feedbacks
The upgrade system was a bit confusing at first. wasn't sure if i was upgrading all at one or not and ended up clicking a bit everywhere bore realizing it was on price for all but only 1 upgrade.
Having to go back to the menu after each game then click on upgrade then play is a lot of step to replay. It would be more efficient to have the shop appear every time you die then have a replay/continue button to get right back into it.
All in all, it's a really decent entry. with some more polishing & QOL adjustement it could get really fun :)