Thanks for the feedback! I just released an update for the game that should fix the jumping issue, as well as the potential crash when finishing a level.
Viewing post in Wani Wani Picnic: Playdate Edition comments
Thanks! The Playdate lets you specify some images to display on-screen between the main menu and the game starting, so I used that to do a simple "wipe" transition. Basically, the sprite walks left to right, the right side of the screen looks like the main menu, and the left side of the screen displays the title screen of the game. The sprite moves to the right until the whole title screen is displayed. Then the game loads.