Pls comment your favourite PICO-8 game and cart

Just one... I could name a dozen favorites depending on the genre.
I'd say ascent
https://www.lexaloffle.com/bbs/?tid=49177
It might be the most memorable, but it's not amongst the ones I play the most by far...

Its a tie between 2, since I play these every single week:

• Buzzkill: https://www.lexaloffle.com/bbs/?tid=3877
• Flooded Caves: https://www.lexaloffle.com/bbs/?tid=47247

For me it's https://www.lexaloffle.com/bbs/?pid=40778

One of the most fun and challenging ones I've played so far has got to be Woodworm: https://www.lexaloffle.com/bbs/?tid=142717

But I agree with Verb too, "Feed the Ducks" is a classic.