I'm amazed this hasn't got more attention already. While I found ties to the restriction to be a little loose, this is an incredibly solid game. The visuals are great, the audio is great, the platforming and upgrades are awesome and feel really good to play.
I played the normal and hard mode and both were lots of fun.
My only criticism right now is that you need an end screen for showing speedrun time properly as well as how many collectibles you got.
Anyhow, Kudos to your team for making this.