absolutely love this game! One thing I'd like to see changed is a tiny bit more invincibility after getting hit. Too many times I lost my last 3 HP so quickly that I couldn't react fast enough to heal.
ok, the invincibility is fine once you get a few more upgrades.
Personal best right now is 1:02 with 44 bosses killed.
In the "late game" you have so many wall punch upgrades that you can't keep the window at a smaller size. Because of that I can't reach the window of the smiley boss and it hides behind the main window for minutes at a time. I killed 1-2 other bosses DURING one smiley