Bounce Tales Jar 480x800 Top -

Players can unlock different forms like Bumpy (a heavy rock ball that breaks walls) and Wolly (a high-jumping beach ball) to solve puzzles.

It appears to be either:

If you cannot find the exact JAR, use a modern J2ME emulator that supports resolution hacking. Emulators like or FreeJ2ME (PC) allow you to force an original 240x320 Bounce Tales JAR to render at 480x800. In J2ME Loader: bounce tales jar 480x800 top