I've spent a bit of time finally (bare) knuckling down to playing some Streets of Rage 4 over the last few days since recording some footage for the podcast, and I'm super-impressed with it. It's one of the most immaculately designed games I've ever played — clearly put together with absolute love, tested thoroughly and paced absolutely perfectly.
It feels like Streets of Rage, but it looks beautifully modern. It offers a challenge so perfectly tuned I found myself progressing through the game and finding health items exactly when I needed them. It provides varied and interesting encounters through clever use of stage gimmicks and enemy combinations. In all, it's the love letter to the series everyone wanted it to be, and mature Blaze is super-hot.
I'm seriously impressed. As Chris noted on the recent podcast, it manages to pull all this off without feeling the need to artificially pad itself out with RPG elements and other such bits and bobs — there are unlockables, some of which are tied to your total lifetime score, but there's no "grinding" required to just be able to get through the game. In fact, the default mode focusing on a single stage at a time rather than a full arcade-style run from start to finish is a masterstroke; it allows you to just take your time enjoying the game, then later you can return to favourite stages or indeed tackle the whole thing in old-school arcade style.
I'll write something in more depth about it on MoeGamer when I've spent a bit more time with it — I haven't finished one playthrough just yet — but if you're a 16-bit beat 'em up fan and you haven't played this yet, I urge you to jump on it at the earliest opportunity!