In my opinion, a better way than ads to grow your game is contacting small youtubers or streamers after getting to know them to have them play it. It will help a lot. Also, the first design could use a bit more color and decorations. Bids will need to be much more than just 200 to get a good CTR and good impressions and clicks. I spend 500-1k myself on test ads, then see how they do, running different variations (Like you did), then bidding higher numbers on each, with the highest bid being on the statistically-shown highest engagement ad.
As I said before, though, you will have a bad CTR more than a good one. It is only natural, and takes time. With enough bidding, visits, and players concurrently, you will eventually naturally gain a playerbase that stays, as the Roblox algorithms begin to recognize and pick up your small game. That’s why I do the small YouTubers thing first; So when I advertise, people click the ad, see people playing my game, play themselves, and invite friends to play with them, thus allowing for more engagement.
See where I am going here? Advertising is not always the best way to grow a game. You will need higher bids to get a good CTR most of the time. It can be very pay to win, sadly. Outbidding can occur, and is common. It’s a huge gamble.