PULSEMAN! I love how you can travel using currents of electricity to get around platforms, very original style of gameplay. Even bouncing off walls is fun! I like how you can charge up attacks too. The level select gives it a Mega Man vibe. Only downfall is that there isn't much variety of levels but it makes up for quantity with quality. The game is short but sweet. Music is very energetic and electric sounding straight out of Pokemon in some places (it is made by the same people after all), but totally fits the Genesis/Mega Drive. Digitized voices are on par with if not better than even Comix Zone, full lines of dialogue too. Visuals are stunning but loud. Colors can be harmful to your eyes if you stare at the game for too long, especially if you are sensitive to seizure inducing flashing. Other than that, it's gorgeous.
ASTAL is easy as a platformer, but beautiful and very detailed. It's a Saturn game that is easier on the eyes too when compared to Pulseman, it's also not as fast paced. I know it seems weird to compare the two back to back but this is how I experienced both. ASTAL being on a disc based console has anime-esque fmv cutscenes with chibi style characters with loads of personality and charm. Music is pretty ambient too, very 90s. Like a lot of Sega's games in the 90s, it's weird, but cool.
I don't have any current gen systems so playing newer titles difficult at the moment. Meanwhile I've been hunting down older titles that I missed over the years for consoles I already own and I'm finding a lot of good ones.