New features: 6 new levels, level redesign of the old levels, boss level, menu redesign, revised menu level selection, new weapon for the boss level, boss HUD, and various new widgets.
Fixes: typo video, removed the useless Retry button (retry is a long press on backspace), removed the useless Cancel button, improved and simplified controls (sideways speed 50%), spaceship physics so it is no longer catapulted into a corner, performance improvements, and removed the bridge in level 1_3.
Planned for 0.6: a reward system based on time and points that unlocks new levels, spaceships and designs, a cut scene, the final video, and a fix for the high score and save game.
Known bugs: high score screen not ready, the end of the level does not lead to the high score screen, the Escape key is referred to as P in the settings, and the mouse wheel is referred to as Up/Down in the settings.