Far more complex and stressful than it lets on, Nuclien is a delightful tap 'em up that genuinely challenges players to focus like little else on Nintendo Switch. Unlike most games on the console, the gameplay actually takes advantage of the touch screen by removing the use of buttons during stages. Each world has its own tap-based gimmick to overcome, with plenty of twists and tension to endure. While the last few stages are especially hard, there's a build-up to the difficulty and players are given all the tools they need to succeed just by paying attention. It isn't particularly long, but Nuclien's reflex-based gameplay is a fantastic way of engaging the brain and the Switch's underused hardware.