Enjoyable little game.
I had fun with this one. It was a good challenge without ever making you feel overly frustrated. I also loved the weapon upgrades, though I wish they had been a little slower to achieve and possibly having more ranks (with bigger bullets - no pun intended). There are only two things I'd like to see:
First: It sucks that you die if you go off the left edge of the screen in level 1, maybe that could just block you like it does for the boss?
Second: A restart button would have been appreciated when I died on Aborted attempts.
In conclusion: thank you for this fun little game. It'll never hold out in replay, but I thoroughly enjoyed myself the entire time while playing in.
On a side note: it seems odd that beating the boss is worth 100 medal points while doing so without dying (significantly harder) is only worth 25. Did you mean to switch those?