Thanks for the tips!! I've played around with the debugger a bit, but I cannot say I maser it yet. But thanks! any questions I might have, I'll definitively ask 
And yes! the symbol file is VERY useful! Although I haven't loaded it in the debugger yet, I use it all the time to measure how much space do the different parts of the code take
Btw, a physical edition of the game is available from matranet.net if anyone is interested!!!
I just submitted a news post for this and the other 2 MSXDev 2017 games that also got a physical edition (Xevimodoki and Draconic Throne!). They are all available for purchase at matranet.net for 25 euros... Here's a link where all three games can be found: http://www.matranet.net/boutique/msx/card/card.php
Featuring amazing cover art by Sirelion!
Already ordered! 