You're trapped in the scary Museum of the Orbs. More explanation in game. Arrow keys to move around. Click map and notes icons at bottom (then return icon to return to main screen). Other buttons will appear bottom centre. Settings icon brings up resolution slider; adjust if necessary to suit your computer, especially if it lags.
Trying to use transparency feature on pen to simulate glass windows of museum. Explosion sound at end from soundbible.com. Updated 21.10.15. Height of player now increased a bit (a number of people suggested that - thanks). Red button now pulses slightly when first seen (thanks to @Griffpatch for suggestion) and mistake in notes corrected (ditto).