A sign post was accidentally moved in front of another one explaining that you need to freeze the fountains first. Stand in the fountain for a bit and it'l freeze, afterwards the gate will change to another sprite and you can enter it
Thanks for the tip! I went back with that in mind and beat it - I enjoyed it a lot! At first I didn't know how it tied into the 'Out of Control' theme, but after playing for a bit I noticed how significantly the melting affects your movement (deceleration, bounciness, etc). It was a lot of fun and I think it has significant potential if the idea is refined and more content is made. Good job!