Thank you for trying out the game!
The demo is currently updated to version 2.0b:
1. Enemies are no longer immediately destroyed after leaving the camera; instead, they continue to track the player for a distance. Enemies destroyed due to distance from the player will also likely respawn immediately in front of the player. Therefore, using running and jumping to quickly complete levels has become more difficult.
2. Fixed a bug where the "Mission Impossible" achievement could not be unlocked.
3. Fixed a bug where jumping to the second-level platform could sometimes cause the player to get stuck.