This game pissed me off to no end as a kid because I remember having that apple viper thing spawn and I thought it was a boss and I couldn't figure out how you were supposed to beat it cuz it had like 99 HP and I had like, 10 or 20 and each of my moves only did like 1 damage to it. I never got past that point so I don't know if you unlock more floors or space after you defeat the one that spawns in the top corner or something else... I don't remember the gameplay loop being very fun but that was probably also me being a small child. Maybe I will replay someday...