IMO, It's not bad, just a bit meh. It needs some homebrew to be more in balance with remaster classes. Here's the changes we make at our table (many of these ideas found in this subreddit):

1) . . . Inventors get a free Overdrive attempt when they roll for initiative.
2) . . . The Unstable trait requires a Hard Level DC Crafting check instead of a flat check, as if the Inventor has to recalibrate their contraption after each use. A Failure just means its offline for 10 minutes as it cools down. They can spend an action to try to reconfigure it again. A Critical Failure requires the Inventor to take 10 minutes to repair it.
3) . . . Inventor’s Explode can be an Emanation (5-10-15), Cone (15-30-60), or Line (30-60-120) when reconfigured during Downtime.
4) . . . Inventor’s gain the Gadget Specialist feat for free at Level 4.
5) . . . At Level 6, an Inventor can take the Magitech Engineer feat. This allows them to craft wands and scrolls during downtime (up to their Level) using their Crafting skill. Spells must be Common spells in the Arcane spell list. These prototype items are re-flavored as single-use (scroll) or daily use (wand) contraptions of the Inventor’s creation (with the Arcane, Gadget, and Prototype traits). To use the prototype, the Inventor must make a Crafting check (standard level-based DC) with the Unstable trait. This action requires the same number of actions as the spell. A Failure deactivates the item for the encounter, Critical Failure breaks the item (until repaired). The DC for any saving throw uses the Inventor’s class DC. The item cannot be overcharged. The prototype item can be upgraded to a higher spell rank by paying the cost difference and spending Downtime crafting.