What I liked:
- The hand-drawn art feels fun.
- You implemented the building and upgrading of bases feature. That's been a goal of mine, but I'm still timid on trying it out.
Suggestions:
- There really wasn't much feedback to the play as to what was happening. If I get hit, as a player, I want to know it and feel that sense of danger. If I hit an enemy, I want to know if I was successful. This feedback could be visual and/or auditory, but it should be there.
- I feel like you should make it clearer to the player that each section is blocked until you kill the enemies. For a while I thought I was encountered a collision issue/bug.
I saw that you mentioned that this is your first game jam and want to congratulate you on submitting! Please don't confuse my criticisms as a put down. I like to provide real feedback to the developer as player. This helps us all get better!