Thanks so much for ALL your work, @ptitSeb. But "unfortunately" I'm visiting extended family in SE Asia atm and could not bring Pandora along...
Will happily report back in 3 weeks
You need to collect bunnies scattered around to finish levels, also you must find stuff to open more areas.
There are different weapons, some are useless against some enemies.
Killed enemies can drop a lot of power-ups, from speed to shield, etc...