Hard to believe you were willing to give up on a great Action-RPG story unfolding before you while you listen to one of the greatest soundtracks in videogame history in a series that is relatively easy and only a couple of hours long... You don't have to level up THAT much, I never felt the sense that I had to do it too much and got bored on that basis... There are far worse relative to Ys and I think they're a little too easy, but I enjoy them for the story, music, characters, etc. for the general reasons I like [Action-]RPGs. But hey, each to his own.
Well, I got Ys I & II for TCD as one of the first games when I got my TCD fixed in mid 2013. I never did play a lot of the game, though; I started it, was disappointed by the huge size of the border around the screen, the somewhat average graphics, and the low difficulty level when compared to the MUCH harder Sega Master System version that I'd gotten several years prior and was my first experience with Ys (in the TCD game, versus the SMS, you move much faster, which maybe reduces strategic movement in combat; combat seems easier; and bosses are easier for sure, early on at least -- of course the SMS game is only Ys I, not also Ys II), and didn't play it for long before stopping. I haven't yet gone back to play it; I wanted to finish that SMS version first, but I got stuck because of how tough that version is (you max out at only level 10 so levelling to each new level takes forever, enemies seem harder, etc.) and never did that, so the TCD and PSP versions of Ys I & II are games I have but still haven't gotten to... I should, sometime, sure. I find the Ys games somewhat overly simplistic (while simple games can be great, overall I do prefer a good balance between simplicity and depth) and definitely don't love the series, but they are good games at least, certainly.
Necro, do you recall places that restore your MP? Or buying MP restoring items?
I think the herbs are it. They can be picked in a few different places (don't they respawn?) or bought from later shopkeeps, but there's not a lot of 'em around. You need to use magic sparingly, mostly relying on your sword to clear the baddies.
Ugh, that's pretty annoying. If you're going to let me play as a mage actually let me use magic as much as I want, darnit! Make replenishing my magic easy! I prefer playing as mages or archer class characters in RPGs, and don't like generic-warrior-hero guys nearly as much most of the time, so of course I wanted to play as the mage in this game. They shouldn't punish you for that by making mana replenishment overly difficult. The game has plenty of flaws, but at least Magicoal lets you replenish mana easily... (and it also has two player co-op, too, like Efera & Jiliora).