@isleepinabed Thank you for the input!
The recent (a few years ago) shmup I remember playing was
Battle huge "Koju" bugs in CAVE's beautiful fantasy shooter, Mushihimesama. Experience the thrill of bullet hell from the masters of the genre as you evade visually stunning shot patterns with thousands of bullets.
store.steampowered.com
I think the game had some type of easy mode, but from what I remember it was not easy for me. I did appreciate the visuals though and the bosses, at least those I managed to get were pretty cool. I also think you had different characters to choose from and they had some type of special powers that you could bring with you in battle.
Indeed, Mushihimesama is one of the most notorious shmups of the bullet hell variety.
I have to also say that in agreement with what you said, most shmups that were ported for home use do indeed tend to offer easy modes or infinite credits.
The easy modes can impact various things like less bullets or enemies on-screen, narrower hitbox of the player's character, shorter stages, more powerful ammo, less resistant bosses or less stages overall.
While this allows novices to see more of the game, the point is to train yourself on easy to then progress to normal/hard/standard modes.
These are the sort of games that will never appear on my most played lists because I tend to play a lot of different ones and for short bursts. But they're the ones I most enjoy to unwind. A quick burst of one or two credits, just to get in the zone (you know, when fingers and eyes are melded with the action on-screen) and I feel renewed. I find them very enjoyable