Simple but fun
HELI 100’s gameplay loop starts off easy to understand, and doesn’t really increase in complexity aside from the increasing variety in enemies and powerups as you progress, but the dogfighting gameplay loop is enough of a joy to keep it fresh for a long time. You’ve got 200 levels to try and sink your teeth into, and the powerups and copters you unlock give a great sense of options for how to tackle each one. I have a few criticisms, though - the short music loops can get kinda annoying after a while, and some enemies move and attack without warning, especially later on.