I do not know if it is me or not but this game run quite fast, I was unable to play it properly, even thought I setted the emulator m88 to 4mhz .
The apsent of lives made my playing and testing quite a cumbersome.
Set the emulator to V1 mode, if possible. V2 / H mode can be considered "hard mode" :D
After the jam, I will add a version with extra lives :)
You might also look for a "memory wait" option in the emulator. ( ウェイト) without this on it doesn't play at hardware speed.