So it seems that I've cleared everything the game has to offer at the current version. Defeated every bosses I could find and slinked into every secret paths there are. Though the road block in the jungle area looks suspicious, I assume that path is being developed for the next update? Since the SNAKE boss appears to be the last point of progression.
Maybe I should use the skip crystal on a different save to compare.
Ramble aside, love the game. Would love it more if we get to pick which Rena variant we can play as (Though that'd get complicated with all the art needed to be done)