"Halloween Islands" is a small one-room hack for in-between.
It contains 50 rooms spread across 8 Levels with 9 custom songs I composed and ported for this (except the titlescreen, overworld and credits music, which are known songs I ported).

Some of the rooms are very tight or need a pretty tough timing. 
This decision was made because of the nature of one-room hacks, where each room is basicly a savestate before each obstacle.