I love the giana esc. concept :) I initially thought the whole switching to “hell” was me just dying or something the like. Maybe shorten the transition or just animate between them (like in giana sisters). Just leaving one more note here, try to keep concistensy in movement direction, as the levels varied in going left and right. Sure you can mix it up, just make it clear for the player where they should go (I got kinda lost).
Overall a good game, well done :)