The physics look very good and believable apart from some rare glitches. Be aware, while this game has a sandbox mode with mindless destruction, its campaign is a puzzle game. You are given a set amount for each of the components (beams, rotators, jet thrusters, bombs, lasers, ...) to destroy a specific building (towers, bridges, ...). Later in the campaign the structures are more abstract and made in a way that requires you to find clever strategies. In last few levels timing is key, as you'll need to activate different mechanisms of your destruction machine at different times.
It doesn't really feel like a retro game despite the look. There's a great variety of weapons and all of them feel satisfying to use, movement is quick and quicker with upgrades as you progress in the game. I'm not a big fan of rouge-lites, but this game has such a big pool of weapons, enemies, envoirments, challenge rooms, etc., so i didn't get bored by the procedural level generation a single second. I liked the minigames that reward you with perks and upgrades very much, always a nice refresher between the levels. The difficulty is well balanced throughout all of the game. As the levels get tougher you learn how to use different weapons properly and how to handle perks like double jump or the grappling hook. The music is top-notch IMO, exactly what you can expect from the legendary Andrew Hulshult. If you're looking for a pure throwback-shooter experience this is not for you, but if you want a thrilling, fun and (for a rouge-lite) surprisingly varied experience you will not regret buying this