Thank you so much for your feedback, it is exactly what I need to continue the development!
Indeed in one week there was not enough reflection. I'm thinking of completely revising the upgrade purchase system and your feedback is a great help! I'm sure you'll be able to help me with this, but I'm not sure how to do it.
I have already fixed the retry bug, I noticed it a few hours after posting it and couldn't change it before the end of the game jam. It was a real blow to my morale...
Thank you for persisting despite the bugs and for going through with this little game!
I'm currently working on fixing all the little bugs that may exist, a totally revised interface, more advanced ship modelling, the possibility to buy new ships, other planets to defend etc... When I release the new version I will be honoured if you test the game again and give me your feedback on the evolutions!
Thanks again, it's thanks to your kind comments that I'll be able to make this game really fun and accomplished!