Hi! Thanks for your feedback.
Once you gain enough points, more types of monsters will start spawning, that will make movement necessary for survival.
Stumbled by the game by accident, while browsing some Speccy libraries on ZX emulator for Nintendo DS. Gameplay-wise, pretty good, also pretty challenging. The music really stands out though! I pretty much left the game alone, with menu music on for a while, because of how good that particular tune is.