Not sure why this is happening. It tends to be more noticeable on lighter shades of color, like light grey and cyan. I tested on two systems, a frontlit GBA SP and an original GBA (both unmodded) and the issue is present on both, though much less so on the original. The screens' voltage...
Just making sure: for SimpleDE, is v1.00 or v1.00-RC1 the latest version? If RC1 is indeed the latest, as claimed in the initial post in the thread, I can't find a way to download it--only v1.00 seems to be available.
I'm currently exploring potential GBA flashcarts to purchase, though I have heard that the Omega Definitive Edition is the only one on the market that supports this linking feature. In particular, I'm wondering if a save file for Metroid Fusion on the ODE will be accessible in order to to unlock...