Surely you keep it in the beautiful box?! 
woah! hahaha, how many cartridges are there?! 100?!?!
And about the physical edition, mine arrived too, but I ordered to my parent's place, which is where my old MSX is and I won't be there until August, so, I'll have to wait to see the physical version myself. But feedback on the cartridge noted! 
Surely you keep it in the beautiful box?!
For disk games, I usually do, since I'm out of disk storage space. But for cartridge games, I usually store them in my drawer o' cartridges for easy access, so I can just open it, grab the game I want, pop it in, and play at a moment's notice. The boxes are then kept in a separate drawer, arranged by like usage (one drawer is devoted solely to homebrew games, one devoted almost solely to Falcom games, and one to big-box games that don't really fit anywhere else).
I like my drawer o' cartridges, though. It's a really tangible way to see practically my whole cartridge collection in one fell swoop. 
(Though I'm running out of space there, too, and have had to start a second drawer! Heheheh.)
-Tom
Today I was thinking that in most of the gameplays I've seen of the game in YouTube, people struggle to beat the first map. So, just to help out get started in the game, I created this small map of the first level of the game:
I hope you find it useful! :)
(also remember that if you find the game too slow, you can always change the viewport size pressing "0" to make it faster :))