I've been sick as hell so I stumbled onto a coping mechanism in this fever-addled state that's worked for me, but no promises that it should work for others: Batsugun. When I was a baby this game was easy to overlook for newer things since CAVE worship was active and relevant in their heyday, and as Toaplan's swansong Batsugun of course represents the beginning of a great many things, as the company's employees spread far and wide in what I would probably consider the most impactful bankruptcy closure in the medium's history, given all that came out of it. It's considered the nascent bullet hell, but it straddles that line in chimeric manner; as much as the bullet curtains can come into play in certain configurations, the baseline of the game is still classic Toaplan where bullets are fast, targeted with precision at the player, and deaths to potshots from popcorn tanks rolling into frame from offscreen aren't that uncommon.
It's a game type I find personally harder than a now-codified curtain STG, so Batsugun in its initial release is a tough game, so much so that it doesn't really even matter that it doesn't loop... fortunately Batsugun Special Version exists and is included in the Saturn port and modern City Connection port derived from it, as the absolute latest Toaplan say on the genre and where they were pushing it. It's significantly more accommodating than the base game, adjusting bullet velocity, player hitbox size, enemy patterns, bomb strength, adds a shield, and all kinds of myriad tweaks that make that initial playthrough of it very doable, a not-too-troublesome 1CC after a few goes at it.
The proverbial gloves come off after that clear, as the subsequent three loops (all cutting one stage from the sequence, until loop 4 consists of just stages 4 to 5) significantly transform the game in introducing revenge bullets to the equation, and making it so the patterns now embody what the phrase "bullet hell" conjures images of in the brain now--you don't get anywhere without streaming shots actively and mindfully. The new loops are beyond my legitimate skill level, but I surveyed them through the rewind gadget in the port, and loop 2 seems like it might be doable with enough persistent practice... but loops 3 and 4 are beyond the realm of conception in how you're supposed to deal with them in my eyes, though I'm sure someone has. They were still extremely fun to sample through and witness what this breaking-apart team and company put together in their last moments together, before they spread out to chart the future of the genre. I'm still sick... but I'm not sick of Batsugun, especially with this new arranged soundtrack with composers like Yosuke Yasui and Shinji Hosoe on board.