Doodle a route with your finger — the ship follows the dots. Lift near an edge to auto-fly the rest of the way. Claim 80% of each stage to clear it. Your drawn trail is vulnerable while cutting; enemies pass harmlessly through the dotted future path. The D-pad works too.
The original web version lives at fillit.pages.dev.
Bugs, ideas, feedback: eli@greattimeapps.com