I'd probably buy your game. Not a total heartbreaker.
I'm not sure about that. What makes each of these games "sing" individually do not necessarily harmonize well together.
I mentioned the rated dice mechanic in Ryuutama and Fabula Ultima. I like that because it then your attributes have to work together. However, a rated-dice mechanic would not work if one wanted a more d20-esque fantasy adventure game. If I used a d20 resolution mechanic, would it be roll over (e.g., Shadowdark, ICRPG, Nimble, etc.) or roll under (e.g., Dragonbane, Black Hack, Cairn/Mausritter, etc.)? Some people absolutely despise roll-under systems even though I personally appreciate how they can speed things up for old school play: i.e., players know as soon as they roll.
Would I utilize classes? How many? Or would I go more classless but maybe with starter Professions (e.g., Dragonbane)? Would there be levels or would I just go level-less?
Would I use Shadowdark or Shadow of the Weird Wizard-style Backgrounds? Or maybe 13th Age Backgrounds? Or would I go with more Fate-like Aspects and Fabula Ultima-like Traits? Dragonbane-like roll under skills also work.
How would I do magic? Because I definitely do not want the usual Wizards (Arcane) and Priests/Clerics (Divine). Would it be roll to cast? Mana points? Would I use ranked spells or just all spells have the same basic level and then have magic rituals with levels (see
Beyond the Wall)?
Plus while I generally like OSR, I'm not necessarily the biggest fan of OSR's love of the old school aesthetic. I'm more of a "new school" aesthetic guy, who also enjoys things like warforged, changelings, dragonborn, tieflings, etc.
I'm genuinely not sure if I could make a good product game, as it likely would be trying to do too much while achieving too little success. It may be better if this was not one game but several.