3-2 (double birdy boost level)
- 8 frames saved by avoiding damage boost and dodging bullets instead with half pixel interrupts (timing is important since we need to fire and wait for 2 bullets)
- 2 frames gained because of timer rule, so boss length isn't improved
4-1
- 2 frames saved by better despawning bitch while keeping cheetah away, missile guy a half pixel away and not let spawn bullet guy's 4th bullet to go for the walljumping route
While 4-1 looks clumsy, it took a while to glue everything into 1 route with minimalized sacrifices. Probably 2 frames lost because of the time rule.
Next plans: 4-2 looks despawn friendly. Going to play with next levels and then reoptimize it from earlier levels.