Thank you for your comment !
Since I bought rpgMaker I was assuming I could use the assets wherever I want but I actually did not read the license so I'll do it '^^
I dont think this game would cause any harm to the RPG Maker creators though, we do not plan to sell it and I dont think it would be a hit. But we'll be more careful about right and license.
Crystals are randoms, but since there are only 2 i guess that may not be really diversified.
This is our first game in the type of bullet hell so we may have overlook somes features like a sound when hit '^^