Hey. I'm glad to hear that were able to get so much gameplay. By all means it sounds like you've done all that there is to be done. If I remember correctly, a few of the upgrades are added procedurally so you won't necessarily reach an end point. This was the first game I worked on, I was just focused on making something a little bit original, and didn't get as far as endgame or post game content.
Thank you for checking it out and taking the time to give some feedback.