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Same issue happens in first Sweet (tested on real hardware, AGB_FIRM and even VBA-M with a proper GBA bios loaded). My best guess is either what you said or the title screen itself (eg. graphics being too big in size or improperly compressed).
Hello. I've tried running the game on an GBA SP and a 2ds, and both freeze after showing the copyrights. I've tested it on a emulator (VBA-M) using a real GBA BIOS, and it does the same thing. The log is spammed with "Undefined THUMB instruction b799 at 03003108". Can this be fixed?