With 50 percentile in the MHT-CET exam, your approximate rank would fall around 60,000 to 70,000 or lower, depending on the overall exam statistics for the year. Admission to top government engineering colleges in Maharashtra for Computer Science Engineering is unlikely at this score, especially under the general category. These colleges usually close their CSE seats at much higher percentiles and lower ranks. However, you still have a chance in private or self-financed colleges, particularly those located in Pune, Navi Mumbai, or rural districts, where cutoffs tend to be more flexible.
Some of these colleges may offer you admission during the later CAP rounds or under the institute-level or management quota. Your chances increase if you're open to choosing a CSE-related specialization like AI-ML, Data Science, or IT instead of core CSE, since those sometimes have slightly lower cutoffs.
You should also participate in all rounds of centralized admission, including spot rounds, and consider filling the option forms very carefully with a large number of choices in descending order of preference.
If you are from a reserved category or home university region, your chances may improve significantly.