I reached level 3 before realizing that I could press [ E ] on those bottles to activate the checkpoint =D Struggled a lot before managing to beat it at the end:
I really liked the whole concept and how you explode and spread poison on walls when you die. One thing that would have been nice is faster death transition since I kept dying so much at the second level and the transition started to feel a bit long.
Very cool and enjoyable game overall. Nice work!