Stay Cool, Kobayashi-san!: A River City Ransom Story is an interesting entry in a genre that is experiencing a revival of sorts on the Switch thanks to the ever-increasing number of re-releases and brand new experiences.
If parachuting onto an island with 99 other people (or, alternatively, staring at a black hole for hours) is your exclusive definition of Battle Royal(e), we can be fairly certain that you weren't around at a time when Kunio’s 8-bit, 4-player multitap-enabled Famicom rumbles coined the expression.
Vasara Collection jumps from obscurity into the top tier of bullet hells on the Switch by offering both original brilliant titles without any technical hiccups and supporting the ever popular TATE option along with a whole new game that proves to be one of the few proper four-player options of the genre on the system. The zany characters and plot just make things sweeter, and make up for the somewhat derivative origin of the series. Considering the relative obscurity of the original releases, for a reasonable asking price you might just end up with three quality, 'brand new' manic shooters in your collection.
Raiden V: Director’s Cut quietly lands on the Switch with little fanfare, and yet feels right at home along with all the numerous other bullet hell shmups currently available on the system.
War Tech Fighters does exhibit a few rough spots here and there, but it is undeniable that it ticks all the right boxes for any self-respecting mecha fan. As of right now, it's a toss-up between this and Project Nimbus Complete Edition for the title of top mecha game on Switch, but if you're after a fast and exciting robot-based space shooter and don't mind long loading times and the odd awkward menu system, then this is worth a look.
Psyvariar Delta truly is a comprehensive package that combines all the features from both Medium Unit and Revision, giving the player the chance to customize the experience in a way that has never been possible in prior releases. Add in the graphical upgrade, Tate support (which is perfect for the Flip Grip, by the way), an exclusive level, a new optional character to use and smooth performance either docked or portable, and this becomes a must-have for any Switch-owning shooter fan; however, casual players or those who simply aren't fans of the genre may find the focus on high scores and short length off-putting.