That's valid I guess it isn't obvious that the lava sends you to the beginning whilst spikes and traps send you to the nearest checkpoint. We have also added death boxes almost everywhere that requires the player to do platforming which send you to a checkpoint but because the lava is rising, it eventually overtakes the death boxes, sending you to the beginning. I'll look into how to make it more obvious as it can be frustrating and new players don't now that.
Regarding the lives you don't have many lives just "one" because of how our checkpointing system works.
Thanks for trying the game and for the feedback!